Device for forming a leno weave



March 29, 1966 L, TATI'CEK 3,242,949

DEVICE FOR FORMING A LENO WEAVE Filed Aug. 31, 1964 2 Sheets-Sheet 1 INVENTOR Au Jon/r 7514' March 29, 1966 L. TATI'EK 2,

' DEVICE FOR FORMING A LENO WEAVE Filed Aug. 51, 1964 I a Sheets-Sheet 2 INVENTOR. A @150 I' F 75 712 91k flag/Lu e4 J ZM United States Patent 3,242,949 DEVICE FOR FORMING A LENO WEAVE Lubomir Taticek, Liherec, Czechoslovakia, assignor to Elitex, Sdruieni podniku textilniho strojirenstvi, Liberec, Czechoslovakia Filed Aug. 31, 1964, Ser. No. 393,155 Claims priority, application Czechoslovakia, Sept. 3, 1963, 4,871/ 63 7 Claims. (Cl. 139-54) The present invention relates to a device for forming a leno weave, particularly for forming fabric selvages of at least three warp threads. In accordance with the invention, one of the three warp threads forms one part of the shed of a leno warp weave, and the two other Warp threads form the second part of the shed, and cross each other after each second pick.

Various apparatus are known for reinforcing the sel vages of fabrics woven on a loom, including devices for forming a leno weave consisting of two warp threads along the selvages of the fabric. However, these devices cause an increased tension of the binding threads and are unsuitable for the binding of a weft thread which is not held at its end which is the case in jet looms using a liquid or gas jet for inserting the weft.

' It is one object of the invention to overcome the disadvantages of known devices for forming a leno weave, and to provide apparatus serving this purpose which is adapted to cooperate with high speed looms.

- In accordance with the present invention, a system of at least three warp threads is used for the leno weave, at least one of the warp threads being a binding thread forming one part of the shed of a leno weave, whereas the other two threads form the second part of the shed, while crossing each other.

One embodiment of a device according to the invention comprises a first thread guide means on a first heald frame, a pair of second thread guide means on the second heald frame, actuating means mounted on the first heald frame; and control means on the second heald frame and being operated by the actuating means during opposite reciprocating strokes of the heald frame to move the sec-0nd thread guide means between end positions located on opposite sides of the path of movement of the first thread guide means with the first heald frame. In this manner, leno warp sheds are formed of the first warp thread guided by the first thread guide means, and of the pair of second warp threads guided by the pair of second thread guide means.

' In the preferred embodiment of the invention, the actuating means is resilient and includes a spring and a rod having an engaging portion adapted to engage corresponding recesses in a tiltable element of'the control means for turning the same between end positions in which the two second thread guide means are alternately shifted in' reciprocating strokes between opposite end positions. The power for shifting the three thread guides, is exclusively derived from the reciprocating motion of the heald frames.

Further features and advantages of the present invention are demonstrated in the specification and in the accompanying drawings, where FIG. 1 represents a side-view section of the device, partly in section,

FIG. 2, a front elevation view of the device in the first wo-rk phase, during the swinging movement of the tilting element to the left,

FIG. 3, a front elevation view of the device in its second work phase, during the change of the shed,

FIG. 4, a front elevation view of the device in its third work phase, during the swinging movement of the tilting element to the right,

FIG. 5, a diagrammatical view of the leno weave,

FIGS. 6-8, the individual work phases during forming of the leno weave by means of three threads.

Referring now to the drawings, a pair of heald frames 1 and 2 are mounted for reciprocating movement in opposite direction in the usual manner. Frame 1 supports a first thread guide means in the form of a needle 3 having a guiding eye 4, and an actuating means including a tie rod 7 suspended between a pair of tension springs 5 and 6 which bias the actuating means 5, 6, 7 to assume a straight position shown in FIG. 3. Rod 7 has a projecting portion or nose 8. Spring 5, which engages a hook 9 of rod 7, is guided in a cylindrical tube 10 which holds spring 5 in a vertical position, while spring 6 can be angularly displaced to permit rod 7 to assume the angular positions shown in FIGS. 2 and 4 in which the nose 8 is displaced transversely from the position shown in FIG. 3.

A holder 11 is secured to a bar 2a of heald frame 2 and carries a journal pin 12 on which a control element 13 is mounted for tilting movement between two end positions shown in FIGS. 2 and 4. The tilting element 13 has in a plane of symmetry passing through the axis of journal 12, a pointed tip 14, and on opposite sides of tip 14, a pair of recesses bounded by noses 15 and 16 which are arranged symmetrically with respect to tip 14. In the same plane of symmetry, two coupling pins 17 and 18-are mounted on element 13.

A pair of second thread guides 20 and 23 having thread eyes 21, 24 are mounted in a straight horizontal groove 25 in holder 11 and are reciprocable in opposite directions between two end positions shown in FIGS. 2 and 4.

Pins 17 and 18 are respectively located in a recess 19 of the upper second thread guide 20, and in recess 22 of the lower second thread guide 23.

When element 13 is angularly displaced on journal 12 between the two end positions, thread guides 20 and 23 are shifted in opposite directions between two end positions which are determined by abutment of journal 12 on the Walls of recesses 26 and 27 through which journal 12 passes, as best seen in FIG. 4.

The binding leno warp thread 28 is guided in the eye 4 of guide needle 3, while eye 21 of the upper thread guide 20 guides the leno warp thread 29, and eye 24 of the lower thread guide 23 guides the leno warp thread 30. As best seen in FIG. 5, leno warpthreads 28, 30 bind the ends of weft thread 31, and the binding warp thread 28 alone constitutes always one part of the shed, While the two crossing warp threads 29 and 3t) constitute the other part of the shed. The warp threads exert a certain tension on the thread guides 20 and 23, urging the tiltable element 13 to turn about journal 12, but the friction of thread guide 20, 23 in groove 25, and of pins 17, 18 in recesses 19 and 20 prevents turning of element 13 by the warp threads 29, 30.

aaaaoae The described device is arranged in the same way on both sides of the shafts 1 and 2, i.e. on both fabric edges. On frame 1, more needles 3 for guiding binding threads 28 can be mounted and every thread guide 20 and 23 can be provided with more than one guiding eye 21, or 24, respectively.

The device according to the present invention works as follows:

The original position of the device is the one shown in FIGS. 1 and 2, i.e. the position, in which frame 1 is in the upper position and frame 2 in the lower one. At this position, the upper thread guide 20 is in its extreme right position, whereas thread guide 23 is in its extreme left position, the thread position in FIG. 6 corresponding to said positions in the perspective front view. In this position, the buffer nose 8 of tie rod 7 with the extension spring 6 is moved by the action of tip 14 of tilting element 13 to the left. The weft thread 31 is always inserted, when frames 1 or 2 are in the extreme upper positions.

Consequently, when weft insertion already took place in the position shown in FIGS. 1 and 2, frame 1 begins to move downwards, whereas frame 2 begins to move upward. Needle 3 with binding thread 28, which formed until now the upper part of the leno weave shed, passes between threads 29 and 30 in the guiding eyes 21 and 24 of thread guides 20 and 23, which formed until now the lower part of the leno weave shed, until the position shown in FIGS. 3 and 7 in which the binding thread 28 constitutes the'lower part of the leno weave shed and the threads 29 and 30 the upper one is reached.

In the position shown in FIG. 3, when frame 2 is in its upper position and frame 1 in the lower one, the left nose 15 of the tilting element 13 is disengaged from the nose 8 of tie rod 7, and said tie rod assumes a vertical position due to springs 6 and 10.

In this phase, another weft thread 31 is inserted.

After the insertion of the weft, frame 1 begins again to move upwards, and frame 2 downwards, whereby nose 8 of tie rod 7 runs on to the right inclined wall of tip 14 of the tilting element 13 and catches its right side nose 16, causing thereby a turning movement of the tilting element 13 around pivot 12 in the anticlockwise direction, said movement causing by pins 17 and 18 a displacement of the upper thread guide 20 from the extreme right position into the extreme left one, whereas the lower thread guide 23 is moved from the extreme left position to the extreme right position, shown in FIG. 4. During this displacement of thread guides 20 and 23 crossing of the threads 29 and 30 takes place, as shown in FIG. 8, said threads constituting at this phase again the bottom part of the leno weave shed, the binding thread 28 constituting again its upper part.

At this position, a further insertion of a weft 31 takes place, after which frame 1 begins to move downwards, and frame 2 upwards, and the whole working cycle is repeated with the difference, that after another insertion of a weft 31 and during the next movement of frame 1 upwards and frame 2 downwards the nose 8 of tie rod 7 catches the left side nose '15 of tilting element 13 bringing thereby the whole mechanism into its original position as shown in FIG. 2.

I claim:

1..A device for forming a leno weave on a loom having first and second heald frames reciprocable in opposite directions, comprising, in combination, a first thread guide means mounted on said first heald frame for movement therewith along a path and adapted for guiding a first warp thread along said path; actuating means mounted on said first heald frame; a pair of second thread guide means mounted on said second heald frame for movement therewith, and for opposite reciprocating movement relative to said necond heald frame in directions transverse to said opposite directions and between two end positions for holding a pair of second warp threads alternately on opposite sides of said path; and control means mounted on said second heald frame for movement therewith and being connected with said pair of second thread guide means, said control means being mounted on said second heald frame for movement relative thereto between two end positions in which said second thread guide means are in said two end positions of the same, said control means being engaged by said actuating means during opposite reciprocating strokes of said heald frames and moved by the same between said end positions thereof so that leno warp sheds are formed of said first warp thread and of said pair of second warp threads.

2. A device for forming a leno weave on a loom having first and second heald frames reciprocable in opposite directions, comprising, in combination, a first thread guide means mounted on said first heald frame for movement therewith along a path and adapted for guiding a first warp thread along said path; resilient actuating means mounted on said first heald frame; a pair of second thread guide means mounted on said second healed frame for movement therewith, and for opposite reciprocating movement relative to said second heald frame in directions transverse to said opposite directions and between two end positions for holding a pair of second warp threads alternately on opposite sides of said path; and control means including a tiltable element mounted on said second heald frame for movement therewith and being connected with said pair of second thread guide means, said tiltable element being mounted on said second heald frame for angular movement relative thereto between two end positions in which said second thread guide means are in said two end positions of the same, said tiltable element being engaged by said actuating means during opposite reciprocating strokes of said heald frames and turned by the same between said end positions thereof so that leno warp sheds are formed of said first warp thread and of said pair of second warp threads.

3. A device according to claim 2 and including a holder secured to said second heald frame and formed with a groove transverse to the direction of reciprocating movement of said frames; and wherein said second thread guide means are slidably mounted in said groove of said holder and have eyes for guiding the pair of second warp threads.

4. A device according to claim 2 wherein said resilient actuating means includes a tie rod having a nose, and at least one spring secured to one end of said tie rod; and wherein said tiltable element has a projecting tip and a pair of recesses on opposite sides of said tip c0- operating with said nose and alternatingly receiving the same during opposite reciprocating strokes of said frames whereby said tiltable element is turned between said end positions for shifting said second thread guide means between said end positions of the same.

5. A device according to claim 4 and including another spring secured to the other end of said tie rod for connecting the same with said second frame.

6. A device according to claim 5 and including a rigid tubular member secured to said second heald frame and having said second spring located therein so that the same is guided for rectilinear movement.

5 6 opposite reciprocating movement, each of said slidable References Cited by the Examiner members having a recess; and wherein said control means UNITED STATES PATENTS include a tlltable element mounted on said holder for turning movement about an axis, and having a pair of 1,226,361 5/1917 Nlederwefer 13954 projecting pins respectively located in said recesses of 5 2,802,488 8/1954 Opletal et a1 139-54 said slidable members of said second thread guide means, 2,918,945 12/1959 Han said tiltable element having a central tip, and a pair of FOREIGN PATENTS recesses on opposite sides of said central tip adapted to 464,248 6/1951 Italy.

engage said nose of said tie rod so that said tiltable element is turned by said nose between two end positions 10 N AL and shifts said slidable members between said two en DO D PARKER Pllmaly Examiner" i i H. S. JAUDON, Assistant Examiner. 

1. A DEVICE FOR FORMING A LENO WEAVE ON A LOOM HAVING FIRST AND SECOND HEALD FRAMES RECIPROCABLE IN OPPOSITE DIRECTIONS, COMPRISING, IN COMBINATION, A FIRST THREAD GUIDE MEANS MOUNTED ON SAID FIRST HEALD FRAME FOR MOVEMENT THEREWITH ALONG A PATH AND ADAPTED FOR GUIDING A FIRST WARP THREAD ALONG SAID PATH; ACTUATING MEANS MOUNTED ON SAID FIRST HEALD FRAME; A PAIR OF SECOND THREAD GUIDE MEANS MOUNTED ON SAID SECOND HEALD FRAME FOR MOVEMENT THEREWITH, AND FOR OPPOSITE RECIPROCATING MOVEMENT RELATIVE TO SAID SECOND HEALD FRAME IN DIRECTIONS TRANSVERSE TO SAID OPPOSITE DIRECTIONS AND BETWEEN TWO END POSITIONS FOR HOLDING A PAIR OF SECOND WARP THREADS ALTERNATELY ON OPPOSITE SIDES OF SAID PATH; AND CONTROL MEANS MOUNTED ON SAID SECOND HEALD FRAME FOR MOVEMENT THEREWITH AND BEING CONNECTED WITH SAID PAIR OF SECOND THREAD GUIDE MEANS, SAID CONTROL MEANS BEING MOUTNED ON SAID SECOND HEALD FRAME FOR MOVEMENT RELATIVE THERETO BETWEEN TWO END POSITIONS IN WHICH SAID SECOND THREAD GUIDE MEANS ARE IN SAID TWO END POSITIONS OF THE SAME, SAID CONTROL MEANS BEING ENGAGED BY SAID ACTUATING MEANS DURING OPPOSITE RECIPROCATING STROKES OF SAID HEALD FRAMES AND MOVED BY THE SAME BETWEEN SAID END POSITIONS THEREOF SO THAT LENO WARP SHEDS ARE FORMED OF SAID FIRST WARP THREAD AND OF SAID PAIR OF SECOND WARP THREADS. 